[all-commits] [llvm/llvm-project] 288c57: [X86] Use inlineasm flag output for the _bittest* ...

[topperc via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 288c5776c9d3cb14abe1c86f961c8ff166772d28
      https://github.com/llvm/llvm-project/commit/288c5776c9d3cb14abe1c86f961c8ff166772d28
  Author: Craig Topper <craig.topper at intel.com>
  Date:   2020-09-28 (Mon, 28 Sep 2020)

  Changed paths:
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/test/CodeGen/bittest-intrin.c
    A llvm/test/CodeGen/X86/bittest-intrin.ll

  Log Message:
  -----------
  [X86] Use inlineasm flag output for the _bittest* intrinsics.

Instead of expliciting emitting a setc in the inline asm instructions,
we can use flag output. This allows the backend to use the flag
directly if it is needed by a branch. Previously we needed a test
instruction to convert the register back to a flag.

If the flag can't be used directly, the backend will emit a setcc.

Differential Revision: https://reviews.llvm.org/D87888